2521387568 has 80 divisors (see below), whose sum is σ = 5723633664. Its totient is φ = 1053569280.

The previous prime is 2521387567. The next prime is 2521387579. The reversal of 2521387568 is 8657831252.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (2521387567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1667933 + ... + 1669443.

Almost surely, 2^2521387568 is an apocalyptic number.

2521387568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2521387568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2861816832).

2521387568 is an abundant number, since it is smaller than the sum of its proper divisors (3202246096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2521387568 is a wasteful number, since it uses less digits than its factorization.

2521387568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890 (or 1884 counting only the distinct ones).

The product of its digits is 806400, while the sum is 47.

The square root of 2521387568 is about 50213.4201981900. The cubic root of 2521387568 is about 1361.0681429839.

The spelling of 2521387568 in words is "two billion, five hundred twenty-one million, three hundred eighty-seven thousand, five hundred sixty-eight".